Transformer



Aug. 3 1926. 1,594,506

W. W. HANSEN TRANSFORMER Filed April 7. 1924 1; 325 HIIIHHHIIIL SECONDARY I'm/2M7;

Patented Aug. 3, 1926.

UNITED STATES WALTER W. HANSEN, OF CHICAGO, ILLINOIS.

TRANSFORMER.

- Application filed April 7, 1924. Serial a. 764,003.

My invention relates to transformers which are well adaptable for general use but particularly useful in the radio field. The general object of the invention is to produce a simple, inexpensive, yet highly efiicient structure in which all the parts for supporting and protecting the windings are in the form of simple stampings which can be readily and quickly assembled.

The transformers are sold to jobbers and dealers and frequently these jobbers or dealers refer to have their own name or trademar on the transformers. An important feature of the invention is therefore such construction and arrangement that a name or legend plate printed when in flat condition may be bent into cylindrical form and serve as the cylindrical wall of the protecting structure or housing for the transformer wlndings. With this arrangement the transformer manufacturer may furnish the name plates, or the .jobber or dealer may furnish his own name plates to be used by the manufacturer in the assembly of the transformer to then form the cylindrical enclosing wall of the windings housing.

Another important feature of the invention resides in the shaping and proportioning of the name plate wall and its end walls to prevent the formation of eddy or other disturbing currents.

The above and other features of my invention are incorporated in the structure shown on the accompanying drawing, in which- Fig. 1 is a side elevational view of a transformer,

Fig. 2 is an end view,

Fig. 3 is a top view, r

Fig. 4 is an interior view of one of the winding housing end lates,

Fig. 5 is a sectiona view on plane 55, Fig. 4,

Fig. 6 is a sectional view on plane 6-6, Fig. 1, and

Fig. 7 shows the flat name and legend plate which eventually becomes the cylindrical wall of the winding housing.

The transformer core is rectangular in shape and comprises the U-shape section 10, and the rectangular section 11 which bridges the ends of the section 10. Both sections are constructed of laminations of suitable magnetic material such-as iron. The sections and their respective laminations are held together by tie plates a, b, c, and d, of nonmagnetic material such as brass, these plates extending along the sides of the vertical limbs of the core section 10 and receiving the core section 11 between their upper ends. Bolts 12 extend through the plates and the sections to compress the laminations together and support the core sections in proper relationship, the core section 11 bemg separated from the section 10 by slight gaps 13 which form a magnetic leak or resistance for stabilizing and balancing the magnetic flow.

Each tie plate has a lateral deflection at its lower end forming a foot 14 and a lateral extension 15 at its upper end forming a shelf, the feet serving to support the transformer structure against a supporting surface and the shelves serving to support terminal structures 16. These terminal structures are of well known construction comprising a screw 17, a nut 18, and a binding nut 19. The screws 17 extend upwardly throu h the su porting shelves to be receivecf and rigi ly secured by the nuts 18, insulation 20 being disposed between the screws, the nut and the shelves to insulate the terminal structure from the shelves.

The core section 11 supports the primary and secondary windings 21 and 22, these windings being on a tubular support 23 which may be readily received by the core section 11. As shown, the terminals 1 of the primary winding are connected with the terminal structures on the tie plates 0 and d while the terminals of the secondary winding connect with the terminal structures on the tie plates a and b. The ends of these terminals may conveniently be inserted in the slot of the screws 17 and securely soldered in place.

In order to shield the transformer windings against inductive, static, and other electrical or magnetic interference or disturbance, and also to protect the windings against physical injury or the weather, the windings are preferably provided with an enclosure of non-magnetic material. I have shown a cylindrical enclosure for the windings comprising the cylindrical wall 24 and the end walls 25 and 26. Sometimes the jobber or dealer prefers to have his own be readily printed or otherwise treated to provide the desired name, trade-mark or other information thereon. When the transformer is then assembled this wall can be then bent into cylindrical shape to form the cylindrical wall ofthe housing for the winding. The end walls 25 and 26 have each a flan e 27, these flanges receiving the sides of the ent up wall 24 and holding it in place. Each end wall has also the rectangular centrally located opening 28 for receiving the winding supporting core section 11, and the openings 29 and 30 are provided through which the terminals of the respective windings may extend to the exterior for connection with the binding structures. To insulate the terminals from the end walls ieces of insulating material 31 such as or inary tape may be glued or otherwise secured over the openings and provided with the small perforations 32 through which the winding leads extend to be then adequately insulated from the metallic end walls.

In order to break up an eddy currents or other disturbing conditlons in the end walls or the wall 24, the end walls are each provided with a radial slot or ap 33 extending from the opening 28 to t e wall periphery, and the edges of the wall 24 are kept separated to form a gap. In order to hold the ends of the .wall 24 separated and also to engage the outer edges of the wall 24 securely against the end wall flanges 27 the corners at the ends of the slots 33 are deflected inwardly to provide abutment shoulders 34 and 35 against which the corners of the wall 24 engage, the adjacent edges of the wall 24 being thus held apart to form the gap and the wall being spread or expanded to securely engage against the flanges 27 of the end walls. The gaps or slot 3:) preferably extend downwardly so that the gap in the wall 24 will be at the lower end of the enclosure, and the enclosure thus protected against the entrance of moisture,

irt, etc.

In assembling the structure the tie plates are first applied to the assembled laminations for the core section 10. The assembly of the core section 11 and the winding structure thereon may be accomplished in various ways. For example, the tube 23 with the winding thereon may first be applied to the assembled laminations for the core section 11, then the bent up name plate applied around the windings and then the end walls applied to the cylindrical wall formed by the name plate, whereafter the assembled structure is applied with the projecting ends of the core section 11 between the upper ends of the tie plates in position to receive the upper screws or bolts 12. The ends of the windings which were inserted through the apertures 32 during assembly of the end walls are then soldered to the terminal structures. After assembly the end walls are securely held in place by the limbs of the core section 10 and the tie plates. A very practical, rigid and neat structure is thus formed. All the metal parts of my structure are of ordinary stock material cut and bent to form in simple dies. All the parts are thus absolutely uniform and when the parts have been assembled and the screws 12 tightened the gaps 13 will be accurately formed, these gaps preventing over-saturation and magnetic distortion in the core thereby causing the operation of the transformer to be noiseless and eflicient.

The name plates which eventually form the cylindrical enclosure wall 24 are all of the same size and marked as desired by the jobber or dealer. Such individual name plate feature does not in any way increase the cost of manufacture of the transformer.

I do not desire to be limited to the exact construction and arrangement shown and described as changes and modifications can be made which will still come within the scope of the invention.

I claim as follows:

1. In a transformer, the combination of a rectangular core comprising a U-shaped section and a straight section brid irtg the ends of the U-shaped section, tie p ates applied to the ends of said sections hold them together and to maintain leaka e gaps between the section ends, the ends oi. said tie plates being deflected laterally, circuit connecting structures mounted on said deflected ends, a preformed coil of transformer windings detachably mounted on said straight section between said gaps, the ends of said windings being connected with said connecting structures, circular end walls detachably applied on said straight section, a rectangular band bent to form a cylindrical wall received be tween said end walls, said end walls having flanges receiving said cylindrical wall and said end walls being held in engagement with said cylindrical wall by the limbs of said U-shaped core section, said walls forming an enclosure for said windings.

2. In a transformer, the combination of a rectangular core comprising a U-shaped section and a straight section bridging the ends of the U-shaped section, tie plates secured to said sections to hold them to ether, the ends of said tie plates being deflected, terminal structures mounted on said deflected ends, a pre-formed coil of transformer windings detachably mounted on said straight core section and having the winding ends connected with said terminal structures, circular end walls detachably applied on said straight core section, a rectangular name plate bent to cylindrical form and applied between said end walls, said end walls having receivin flanges for said 0 lindrical wall and said end walls being held by the sides of said U- shaped section with their flanges in enga ement with said cylindrical wall, said wa ls forming a protective enclosure for said windings.

3. In a transformer, the combination of a core comprising two sections, tie plates secured to said sections to hold them together to form the core, circuit terminal structures mounted on said tie plates, a preformed coil of transformer windings mounted on one of said sections between said tie plates, the ends of the windings being connected with said terminal structures, circular end walls detachably applied on the winding supporting section concentric with said windings flanges extending from said end walls, and a name plate bent into cylindrical form around said windings and received by said flanges, said end walls and plates formi an enclosure for said windings, said eiid walls being held by said plates in engage.- ment with said cylindrical wall.

4. In a transformer, the combination of a rectangular core comprising a U-shaped section and a strai ht section bridging the ends of the U-shape section, tie plates securing said sections together, terminal structures mounted on said tie plates a preformed core of transformer windings detachably applied to said straight section between said plates and the ends of said windings being connected with said terminal structures, circular end walls detachably applied on said straight core section, a rectangular name plate bent to form a cylindrical wall between said end walls and said end walls having flanges for receiving said cylindrical wall, said end walls being held against the cylindrical wall by said tie plate, said Walls forming an enclosing structure for said windings, the ends of said cylindrical wall being separated to leave a gap, and said end walls having radial slots registering with said gap, said gap and slots preventing the formation of eddy currents.

In witness whereof, I hereunto subscribe my name this 2nd day of April, A. D., 1924.

WALTER W. HANSEN. 

